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Specifies a procedure for the measurement, under non-equilibrium conditions, which has been shown by practice to give a reliable indication of the presence of hydrophilic compounds. This tension is determined by measuring the force necessary to detach a planar ring of platinum wire from the surface of the liquid of higher tension, that is, upward from the water-oil interface.
||Petroleum products - Mineral oils - Determination of interfacial tension of oil against water Ring method